(Science: biochemistry) Contains the SCH3 group that can act as a methyl donor (see s adenosyl methionine). Common in proteins but at low frequency. The met x linkage is subject to specific cleavage by cyanogen bromide.
See: formyl peptides. A crystalline amino acid containing sulfur; found in most proteins and essential for nutrition.One of 20 [[amino acids commonly found in [[ proteins.